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Time factors of millions and billions of years is difficult even for adults to comprehend.

However, "relative" dating or time can be an easy concept for students to learn.

Note from a Teacher: I am a veteran teacher of 24 years who teaches in a dual language program.

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It was also discovered that these magnetic reversals were common and occurred on a regular basis.Marcia will bill your district upon delivery of your order (either by email download or Priority Mail) I am a Vendor for many school districts.Ask your office if I'm already a vendor for your district!In the 19th and early 20th centuries, several scientists suggested that the continental masses had the ability to move across the Earth's surface.These early theories of continental drift were based on the following evidence: During the first 30 years of this century the theory of continental drift was actively debated among geo-scientists.